/* 底部导航栏 */
footer {
  width: 100%;
  height: 54px;
  box-shadow: 0 -1px 5px rgb(230, 230, 230);
  position: fixed;
  bottom: 0;
  left: 0;
  display: flex;
  justify-content: space-around;
  align-items: center;
  background-color: white;
  z-index: 999;
  overflow: visible;
}

footer a {
  font-size: 12px;
  color: #8E8E8E;
  display: flex;
  flex-direction: column;
}
footer > a:nth-of-type(4){
  position: relative;
  overflow: visible;
}
.dot{
  position: absolute;
  left: -5px;
  top: -10px;
  width: 22px;
  height: 18px;
  text-align: center;
  line-height: 16px;
  background-color: #FF6F3F;
  border-radius: 50%;
  color: white;
  font-size: 10px;
}

.footerImg {
  width: 19px;
  height: 19px;
  margin: 0 auto 3px;
}

.kongbai {
  width: 19px;
  height: 19px;
  margin: 0 auto 3px;
}

.add {
  position: absolute;
  top: -20px;
  width: 40px;
  height: 40px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.add img {
  width: 40px;
  height: 40px;
}

/* 媒体查询 */
@media screen and (min-width: 500px) {
  body {
    margin: 100px auto 0;
    width: 375px;
    height: 700px;
    border: 1px solid grey;
    z-index: 999;
  }

  footer {
    position: absolute;
    bottom: 0;
    left: 0%;
    width: 373px;
    z-index: 999;
  }
}